Die head



' March 19, 1929. BRElTENsTElN 1,706,105

DIE HEAD Filed May 12, 1926 ff p v ating-member Patented Mar. 19, 1929.

UNITED STATES,

1,706,105 PATENT OFFICE.

ALBERT F. BREITENSTEIN, OF NEW HAVEN, CONNECTICUT, ASSIGNOB TO THE GEO- METRIC TOOL (30., OF NEW HAVEN, CONNECTICUT, A CORPORATION.

DIE HEAD.

Application filed May 12,

Fig. 1 is a view mainly in side elevation and partly in longitudinal section of a die-head embodying my invention.

Fig. 2 is a plan view thereof with a part of the operating-sleeve broken away.

Fig. 3 is a view thereof in front elevation.

Fig. 4 is a detached view in side elevation of one of the chasers.

Fig. 5 is a similar view in front elevation of one of the chaser-retracting plungers.

Fig. 6 is a similar view thereof, partly in side elevation and partly in longitudinal central section.-

My invention relates to an improvement in die-heads of the class having radially-movablechasers forced inwardly into their cutting positions by an operatingmember having chaser-operating, chaser-retracted, and chaser-clearance positions, the object being to produce a simple, convenient and effective tool constructed with particular reference to the mechanism employed for retracting the chasers.

With these ends in view, my invention consists in a die-head having chasers, an opertherefor, radially-movable spring actuated plungers for the respective chasers, and means carried by the plunge-rs and engaging with the chasers in position to eXert outward draft thereupon in such manner as to permit the chasers to be radially removed from the die-head independently of the plungers. V p

My invention further consists in a die-head characterized as above and having certain details of construction and combinations of parts as will be hereinafter described and particularly pointed out in the claims.

In carrying out my invention as herein shown, it is embodied in a diehead of standard construction having a skeleton-body 10 provided with a shank 11 by means of which it is mounted for use. The said body mounts a chaser-operating memberin the form of a sliding operating-sleeve 12 adjusted in position for varying the cutting diameter of the die-head in the ordinary manner by means of an adj Listing-nut 13 threaded upon the shank 11, the said sleeve having a forward or operating position, an intermediate or chaserretracted position, and a rear or chaserclearance position.

The said body 10 is provided at its forward end with four equidistance radial slots 14 re spectively receiving one of four correspond- 1926. Serial N0. 108,492.

ing chasers 15, each of which is provided with cuttingteeth 16 at its inner end, and a bevel 17 at its outer end for co-action with a camsurface 18 formed by notching the inner edge of the forward end of the sleeve 12. i

To provide for the radial retraction of the chasers 15 into their retired or non-cutting position, I form the inner rear corner of each with an inwardly-opening notch 19 for the reception of a hook 20 at the lower end of each of four spring-arms 21, the upper end of each of which terminates in a centrally-perforated plate 22 secured by a rivet 23 to'the upper end of a cylindrical chaser-retracting plunger 2% located in a plunger-chamber 25 formed in the body 10 at a point directly back of each of the slots 14 therein and connected with the slots by a passage 26 through which the hook 20 passes for entrance into the notch 19 of the chaser and in which the hook is free to move radially with its complementary plunger 25. For the actuation of the said plunger, each is provided with a socket 27 for thereception of a helical plunger-retracting spring 28 resting upon the bottom of its chamber 25.

Normally, the chasers are retained in the die-head against the outward thrust of the. springs 28 by the engagement of their outer ends with the sleeve 12 when in its operating position, as shown by full lines in Figs. 1 and 2, and when in its intermediate or chaser-retracted position, as shown by broken lines 29 in Fig. 1.

By preference, the spring-arms 21 are set away from the plungers 24 as shown in Fig. 6, to make a sufficient frictional contact with the inner edges of the chasers to prevent them from falling out of the die-head by gravity or under vibration when the sleeve is in its chaser-clearance position, while the plunger-s themselves are prevented from falling out by the forward edge of the sleeve in such position. On the other hand, the spring-arms, by their frictional engagement with the inner edges of the respective chasers, permit the chasers to be individually inserted into the die-head and retained in place, thus avoiding the necessity of manually holding the four of them concurrently in alace until the operating-sleeve is engaged with their beveled out-er ends.

By coupling the chasers and plungers in the manner described, the chasers may be radiallyremoved independently of the plungers when the chaser-operating sleeve occupies its chaser-clearance position.

A device for yieldingly retaining the chasers in the die-head is not broadly claimed operating member having chaser-closing,

chaser-retracted, and chaser-clearance positions, radially movable spring actuated chaser-retracting plungers, arms carried thereby and extending inwardly beyond the inner ends thereof and adapted to engage with the notched inner ends of the chasers in position to exert outwarddraft thereupon and to permit the chasers to be radially removed independently of the plungers when the-chaser-operating member is in its chaserclearance position.

2. A. die-head having Chasers, each formed at its inner rear corner with an irnvar-dly opening notch, a sliding chaser-operating sleeve co-acting with the outer ends of all of the chasers and adapted to assume chaserclosing, chaser-retracted, and chaser-clearance positions, radially-movable, springa ctuated plungers mounted in the diehead, and hooked arms carried by thesaid plungers and extending inward beyond the inner ends thereof and entering the said notchesof the,

chasers for coupling the same to the plnngers, whereby the same exert outward draft thereupon and whereby the chasers are radially removable independently of the plungers when the said operating-sleeve is in its chaser- 'clearance position.

3. A diehead having radially-movable and radially-removable chasers, a chaseroperating member having chaser-closing chaser-retracted, and chaser-clearance positions, radially-movable springactuated chaser-retracting plungers, and yielding means irictionallyengaging directly with the bodies of the chas-ers for preventing them from dropping out of the die-head by gravity when the chaser-operating member is in its chaser-clearance position and engaging with the chasers for normally exerting positive outward draftu 'aon them. I

a. A die-head having radially-movable and radially-removableV Chasers, a chaseroperating member having chaser-closing, chasei'-1'etracted, and chaser-clearance positions radially movable spring actuated chaser-retracting plungers and spring-arms carried by the said plungers, frictionally engaging with the chasers for preventing them from dropping out of the die-head by gravity when the chaser-ogerating member is in its chaser-clearance position and shaped to engage with the chasers for normally exerting positive outward draft upon them.

5. A die-head, having radially-movable and radially-removable chasers each formed at its inner rear corner-with an inwardlyopening notch a chaser-operating member having chaser-closing, chaser-retracted, and ehasenclearance position, radially-movable spring-actuated chaser-retracting plungers and spring-arms carried by the said plungers and iirictionally engaging with the chasers for preventing them from dropping out of r specification.

ALBERT F. BREITENSTEIN. 

